The term user experience was coined by Donald Norman in the 1990s. A review of his earlier work suggests that the term "user experience" was used to signal a shift to include affective factors, along with behavioral concerns, which had been traditionally considered in the field. Every product/service solves an unmet need or a glaring problem. Solving an unmet need or a critical problem is one thing. Creating a delightful experience while getting work done is another thing. While any user might start using the product to accomplish some tasks, one of the aspects that might retain the user or improve loyalty is user experience. Understanding how users feel involves becoming aware of man-machine interactions using techniques like interviewing users, watching how users use products in real world, studying how psychology and cognitive science works. This knowledge then, can be used to improve the overall user experience. Sadly, many of those who talk about UX as though it’s a set of tools and approaches often forget about the human side of products. A range of tests can be performed while a user is engaging with a piece of software to ensure that the user is never forgotten at any point of the development process. Some of these tests include usability testing, A/B testing and so forth.